Jesse b



(No Model.)

J. BfTHOMPSON.

NUT LOOK.

Patented Dec. 22, 1885.

I y a H! V UNITED STATES PATENT OFFICE.

JESSE B. THOMPSON, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-FIFTH TOCLARENCE W. BALLARD, OF SAME PLACE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 332,972, dated December22, 1885.

Application filed September 24, 1885. Serial No. 178,018. (No model.)

To all whom it may concern:

Be it known that I, J EssE B. THOMPSON, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented certain new and. useful Improvements in Nut Locks, of which thefollowing is a specification, to wit:

This invention relates to nut-locks; and it consists in the peculiarconstruction and arrangement'of the same, substantially as will behereinafter more fully described and claimed.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the accompanying drawings, inwhich- -Figure l is a perspective view of my nutlock. Fig. 2 representsthe bolt. Figs. 3 and 4 are two different formsof one of my locknuts,and Fig. 5 is the other nut ofa pair.

a represents a bolt, which is formed with two threads, (0 o one of whichis a right and the other a left hand thread, as in Fig. 2. On this bolt,after it is placed in position, I place two nuts, I) b, one of which isformed with recesses c on its face and the other is preferably of softermaterial. These recesses may be of any desired shape. In Fig. 1 they areshown as grooves running diagonally across the nut, while in Fig. 3 theyare run radially from the bolt-opening, and in Fig. 4 a series ofdepressions or sockets are shown, all of which answer the purposedesigned.

When the inner nut is screwed tightly down to place,the outer one is puton and also screwed down tight upon the first. With a punch or similarinstrument a portion of the plain nut is driven down into the recessesof the other nut, and thereby locks them together. As the nuts move inopposite directions, the loosening of one only tends to tighten theother, and as the contacting or interlocking parts of two nuts are sosmall a wrench will readily turn off the outer nut and leave the innerfree to be removed. The recesses being scattered over the face of thenut some are always convenient for driving in a portion of the other,and while it is not necessary, yet it will be found advantageous andpreferable to make the plain nut of softer metal than the other, wherebythe punching of the locking-projection is rendered easier, and this ismore easily cut off or pushed aside by the other nu't when the strain ofa wrench is applied to remove them.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a nut-lock, the combination, with a bolt having a right and a lefthand thread, of

two nuts,-one of which is formed with a recessed face and the otherhaving a projection punched into the recess, substantially as and forthe purpose set forth.

2. In a nut-lock, the combination, with a bolt formed with twooppositely-pitched threads, of two nuts, one of which is formed with arecessed face, and the other is made of softer material and has aportion punched into said recess after being placed in position,substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JESSE B. THOMPSON.

Witnesses:

CLARENCE W. BALLARD, W. O. MOARTHUR.

